4 Story?

The Vehicle app asks about how many 4 story buildings you have in your responce area. We have two. One is 3000 X 300, the other is 2100 X 300. Do I really only get to count this 1.5 million sq ft lumber mill complex as 2 4 story bldgs? Last year the computer tossed us out, likely because I answered 2. They never got to the narrative to see the real hazards. Thoughts?
Jonathan